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48 Cards in this Set
- Front
- Back
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where do flowers come from what are they triggered by
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leaves the hormone florigen
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what are the 4 receptacles/whorls of flowers
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1.calyx
2.corolla 3.Stamen 4.Carpel |
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What is a calyx made up of?
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sepals
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Is the stamen male or female?
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male
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How many parts to a stamen
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anther and filament
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what is the female reproductive part?
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corolla
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how many parts of the female
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stigma, style.\ovule and ovary
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why are Flowers are easier to reproduce then the cones
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because pollination is way easier
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What is a complete flower?
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has a lll 4 whorls
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Can a flower be missing a male or famel part?
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yes like holly (incomplete)
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What is a the part of the flower that is the male gametophyte?
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pollen grain
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Wht is the female gametophyte?
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embryo sac
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The embryo sac has how many cells and how many nuclei
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7 cells and 8 nuclei
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What is double fertililzation?
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egg and nuclei are fertilized
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how many angiosperms depend on use of wind only
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10%
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What is an example of coevolution
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plant pollinators relationship darwin noticed beak of finch depended on flower shape...wide open or skinny
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What delivers the 2 sperm?
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pollen tube
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why 2 sperm?
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egg and 2 polar nuclei
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what results in doublee fertilizatoin
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diploiid zygote and triploid endosperm
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is double fertilization only in angiosperm?
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yes
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What is inside a seed? 4
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embryo, food, cotyledons, seed coatt
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Why are cotyledons so big?
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because they turn into leaves and leaves are used to make photosynthesis and needs to be done quick
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typicality what becomes the fruit?/
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the ovary
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What is an example of a fruit that is not an ovary?
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apples
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Are nuts fruit?
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yes
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Where do fruits grow from?
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shoots and stem
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What are the different types of fruits?
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simple (cherries) aggregated (berrys) and multiple (pineapple)
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What is the point of fruit/
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disperable of seeds.
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Angiosperms have what for for special disperable?
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seeds
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what is germination
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resumption of growth after seed dormancy
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Why is seed dormancy important
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gives time for dispersal
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What drives a seed germinate?
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water, oxygen, temp.
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What does the water absorption do to the seed?
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pops one the seed coat.
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what is oxygen needed for germination?
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respiration
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Do plants have glands?
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No
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Can a single hormone do 2 things?
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yes it can stimulate or inhibit
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Classic 5 plant hormones?
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auxins, cytokinins, gibberellins, ethylene, abscisic acid
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What do auxins do in plants?
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growth hormone to elongate stem cell and fruit development
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what does cytokinins produced in plants?
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cello division, lateral buds, delay senescence (plant aging)
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what does gibberellins do?
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cel division, break seed dormancy
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what is ethylene for?
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fruit ripening, senescence and abscission
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what is absic acid for?
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hard stop to lead into dormancy
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Why is leaf abscission useful?
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b/c there is not a lot of sunlight in winter, the stem absorbs nutrients for the winter because leaves just cause loss of water, nutrients
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In dormancy where does a tree gets its nutrients?
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the stored nutrients in the stem since there is not alot of nurtrients in the soil and hard to absorb because its cold.
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what is phototropism?
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growth toward light
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What causes the plants circadian rhythm?/
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central oscillator controls it
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What causes a long v short day for plants?
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flowering and photoperiod not to much on temperature. depends on how many hours of darknes there is NOT of sunlight.
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Why is the sun important?
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growth, circadian rythms, when to bloom and photosynthesis
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